3-Butynoic acid CAS 2345-51-9

Purity 97%+In StockPharmaceutical Standards
CAS No.2345-51-9
Molecular FormulaC4H4O2
Molecular Weight84.07 g/mol
CategoryPharmaceutical Standards / API Standards
AvailabilityIn Stock

Chemical Structure

3-Butynoic acid CAS 2345-51-9 chemical structure

Description

Compared with other compounds in its class, the molecular weight of 84.07 g/mol gives 3-Butynoic acid distinctive chromatographic separation conditions and mass-spectrometry parameter settings.

CATO supplies 3-Butynoic acid (CAS 2345-51-9), a certified reference material (molecular formula C4H4O2, MW 84.07 g/mol) for analytical method development and quality control.

The molecular framework of 3-Butynoic acid (C4H4O2) is characterized by a carboxylic acid group, a hydroxyl group, an ether linkage. In reversed-phase chromatography, its retention is governed primarily by the polarity and ionization state of its functional groups, which provides a practical basis for HPLC-UV/DAD or LC-MS method development. The presence of an aromatic ring or conjugated system gives the compound characteristic absorption bands in the UV-Vis region, making it well suited to UV or diode-array detection (DAD).

Recommended for analytical method development and validation; each product is supplied with a full Certificate of Analysis (COA) ensuring ISO 17034 metrological traceability.

The assigned purity is verified by mass-balance and quantitative NMR (qNMR) approaches, with the expanded uncertainty reported at a 95% confidence level (k=2). Batch homogeneity and stability are independently assessed for every lot.

Physical & Chemical Properties

Molecular FormulaC4H4O2
Molecular Weight84.07 g/mol
Purity97%+
StorageStore at 2-8°C
Solubility (reference)Soluble in methanol, acetonitrile, DMSO, water (slightly soluble)
StabilityMay oxidize slowly on prolonged air exposure
Degree of Unsaturation (DBE)3.0
UV AbsorptionUV-absorbing
CAS Registry Year (est.)1957

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